English

Definition of factorial noun from the Oxford Advanced Learner's Dictionary

 

factorial

 noun
noun
BrE BrE//fækˈtɔːriəl//
 
; NAmE NAmE//fækˈtɔːriəl//
 
(mathematics) Mathematical terminology
 
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the result when you multiply a whole number by all the numbers below it 5! (= factorial 5) is 120 (= 5 × 4 × 3 × 2 × 1). See related entries: Mathematical terminology
See the Oxford Advanced American Dictionary entry: factorial